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IRS / Tax

Fill out Schedule A (Itemized Deductions) online

Schedule A is used to claim itemized deductions instead of the standard deduction on your Form 1040. It covers medical expenses, state and local taxes, mortgage interest, charitable contributions, casualty losses, and other miscellaneous deductions.

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How to fill out Schedule A (Itemized Deductions)

1

Calculate medical and dental expenses

Enter total medical and dental expenses on line 1. Subtract 7.5% of your AGI (line 3). Only the amount exceeding this threshold is deductible on line 4.

2

Enter taxes you paid

Report state and local income taxes (or sales taxes), real estate taxes, and personal property taxes. The combined deduction for these taxes is capped at $10,000 ($5,000 if married filing separately).

3

Report interest you paid

Enter home mortgage interest reported on Form 1098. Include points paid on the purchase of your main home and investment interest expenses from Form 4952.

4

Claim charitable contributions

Enter gifts to qualified charitable organizations. Cash contributions require written acknowledgment for amounts of $250 or more. Non-cash contributions over $500 require Form 8283.

5

Total your deductions and compare

Add all deductions on line 17. Compare this total to the standard deduction for your filing status. Enter the larger amount on Form 1040, line 12.

About Schedule A (Itemized Deductions)

Who needs this form

Taxpayers whose total itemized deductions exceed the standard deduction for their filing status. Common situations include homeowners with large mortgage interest payments, taxpayers with significant charitable donations, and those with substantial state and local tax payments.

Where to submit

Attach Schedule A to your Form 1040 when filing. The total itemized deductions from line 17 transfer to Form 1040, line 12.

Source and content freshness

Official source (www.irs.gov)
  • Reviewed: 2026-02-24
  • Check the latest official form instructions for the filing year that applies to you.
  • Filing deadlines may shift for weekends and holidays. Verify due dates with official instructions.

Common mistakes to avoid

  • Itemizing when the standard deduction would result in a lower tax liability
  • Exceeding the $10,000 cap on state and local tax (SALT) deductions
  • Deducting medical expenses that do not exceed 7.5% of adjusted gross income
  • Not keeping adequate records and receipts for charitable contributions

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Should I itemize or take the standard deduction?
You should itemize if your total deductions on Schedule A exceed the standard deduction for your filing status. For most taxpayers, the standard deduction is the better choice since it was nearly doubled by the Tax Cuts and Jobs Act. However, homeowners with large mortgages, those with significant charitable giving, or taxpayers in high-tax states may benefit from itemizing.

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